Seriously? You're looking for a way to irmpove fuel consumption on a 1960's Gas Hog becasue all you're going to do is take a 9MPG engine to 11MPG. There is no miracle going to get you from 9MPG to 40MPG. After you do all the things mentioned above 2-3mpg is all you're going to get (yeah, but that's still 25%
). In the end, you'll get close to 200 miles on a tank. Less if lots of city/stop-n-go, a little more if pure highway cruising with a Tremec in 5th. If gas mileage is what you want then a 427 Cobra isn't the right vehicle.